F.’em: FM Synth Plugin by Tracktion for Windows and macOS Free Download

The core of F.’em is its operator matrix. Eight wave operators, two multisample operators and a noise operator can be routed without fixed algorithms, so you are not limited to preset FM routing structures. Wave operators offer waveforms ranging from sine to analog-style shapes and the waveforms found in some classic FM synthesizers, and they support hard sync like an analog synth.

Each operator has its own pitch and level LFO and its own pitch and level envelope, along with keyboard level scaling. That gives fine control over how each operator behaves across the keyboard and over time.

Envelopes in F.’em can run up to 32 stages, are loopable and can be tempo-synced, which suits rhythmic and evolving patches. Two Flow LFOs offer freely editable shapes, so you can draw custom modulation curves rather than relying only on standard waveforms.

The 200-entry modulation matrix and 32-algorithm modifier matrix handle the routing. Automation covers most continuous parameters, and a quick edit panel gives direct access to timbre and overall envelope.